//                                  -*- C++ -*-
/*

Copyright (C) 1996 John W. Eaton

This file is part of Octave.

Octave is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option) any
later version.

Octave is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.

You should have received a copy of the GNU General Public License
along with Octave; see the file COPYING.  If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/

#if !defined (octave_QR_h)
#define octave_QR_h 1

#if defined (__GNUG__)
#pragma interface
#endif

class ostream;

#include "dMatrix.h"

class
QR
{
public:

  enum type
    {
      std,
      raw,
      economy,
    };

  QR (void) : q (), r (), tau (0), work (0), tmp_data (0) { }

  QR (const Matrix& A, type qr_type = QR::std);

  QR (const QR& a) : q (a.q), r (a.r) { }

  QR& operator = (const QR& a)
    {
      if (this != &a)
	{
	  q = a.q;
	  r = a.r;
	}
      return *this;
    }

  ~QR (void)
    {
      delete [] tau;
      delete [] work;
      delete [] tmp_data;
    }

  Matrix Q (void) const { return q; }

  Matrix R (void) const { return r; }

  friend ostream&  operator << (ostream& os, const QR& a);

protected:

  Matrix q;
  Matrix r;

  double *tau;
  double *work;
  double *tmp_data;
};

#endif

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